Walker-Warburg syndrome (WWS) is a rare form of autosomal recessive, congenital muscular dystrophy that is associated with brain and eye anomalies. Several genes encoding proteins involved in abnormal α-dystroglycan glycosylation have been implicated in the aetiology of WWS, most recently the ISPD gene. Typical WWS brain anomalies, such as cobblestone lissencephaly, hydrocephalus and cerebellar malformations, can be prenatally detected through routine ultrasound examinations. Here, we report two karyotypically normal foetuses with multiple brain anomalies that corresponded to WWS symptoms. Using a SNP-array examination on the amniotic fluid DNA, a homozygous microdeletion was identified at 7p21.2p21.1 within the ISPD gene. Published data and our findings led us to the conclusion that a homozygous segmental intragenic deletion of the ISPD gene causes the most severe phenotype of Walker-Warburg syndrome. Our results also clearly supports the use of chromosomal microarray analysis as a first-line diagnostic test in patients with a foetus with one or more major structural abnormalities identified on ultrasonographic examination.

• MeSH
• delece genu * MeSH
• exprese genu MeSH
• homozygot MeSH
• karyotyp MeSH
• lidé MeSH
• lidské chromozomy, pár 7 MeSH
• mozek metabolismus   patologie   MeSH
• nukleotidyltransferasy nedostatek   genetika   MeSH
• plod MeSH
• potrat eugenický MeSH
• rodina MeSH
• sekvenční analýza hybridizací s uspořádaným souborem oligonukleotidů MeSH
• syndrom Walker-Walburgové diagnóza   genetika   patologie   ultrasonografie   MeSH
• ultrasonografie prenatální MeSH
• Check Tag
• lidé MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• kazuistiky MeSH

Jacobsen syndrome (JBS) is a rare chromosomal disorder caused by terminal deletion of the long arm of chromosome 11. We report on four prenatally diagnosed patients with JBS with variable prenatal and postnatal phenotypes and 11q deletions of varying sizes. Precise characterization of the deleted region in three patients was performed by SNP arrays. The severity of both the prenatal and postnatal phenotypes did not correlate with the size of the haploinsufficient region. Despite the large difference in the deletion size (nearly 6 Mb), both of the live-born patients had similar phenotypes corresponding to JBS. However, one of the most prominent features of JBS, thrombocytopenia, was only present in the live-born boy. The girl, who had a significantly longer deletion spanning all four genes suspected of being causative of JBS-related thrombocytopenia (FLI1, ETS1, NFRKB, and JAM3), did not manifest a platelet phenotype. Therefore, our findings do not support the traditional view of deletion size correlation in JBS or the causative role of FLI1, ETS1, NFRKB, and JAM3 deletion per se for the development of disease-related thrombocytopenia.

• MeSH
• chromozomální delece * MeSH
• dospělí MeSH
• fenotyp MeSH
• genetické asociační studie MeSH
• Jacobsenův syndrom genetika   patofyziologie   MeSH
• jednonukleotidový polymorfismus genetika   MeSH
• kojenec MeSH
• lidé MeSH
• lidské chromozomy, pár 11 genetika   MeSH
• mladý dospělý MeSH
• protoonkogenní protein c-fli-1 genetika   MeSH
• trombocytopenie genetika   MeSH
• Check Tag
• dospělí MeSH
• kojenec MeSH
• lidé MeSH
• mladý dospělý MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• kazuistiky MeSH